New version of tac.c

[Natanael Copa]

On Thu, 2008-01-10 at 09:01 +0100, Tito wrote:
> Hi Denis,
> couldn't we change this 0x7f 
> 
> if (!(i & 0x7f))
>     /* Grow on every 128th char */
>     line = xrealloc(line, i + 0x7f + sizeof(int) + 1);
> 
> into a define
> 
> #define WHATEVER                          0x7f
> 
> so that it could be changed in one place
> and to improve readability for newbies like me. :-)
> 
> Just an idea.

see attatched patch

but im not sure if it makes code more readable

> 
> Ciao,
> Tito
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